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BiologyClass 10ICSE

Name (i) largest artery, and (ii) largest vein, in our body.

Aorta is the largest artery in our Vena cava is the largest vein in our

BiologyClass 10ICSE

What stops blood from flowing backward through the heart?

The valves present in the right and the left atrium prevent the blood from flowing backward into the atria. The tricuspid valve mainly helps in doing this process.

BiologyClass 10ICSE

Where does blood absorb oxygen?

The blood absorbs oxygen in the lungs. Lungs are a vital part of the respiratory system. Alveoli helps blood to absorb oxygen in the lungs.

BiologyClass 10ICSE

Veins and arteries carry blood. Which of these carry blood: (a) away from the heart? (b) back to the heart?

Arteries carry blood away from the Veins carry blood back to the

BiologyClass 10ICSE

Which organ acts as a pump in the circulatory system?

Heart acts as a pump in the circulatory system to push out blood.

BiologyClass 10ICSE

What substance/substances are transported in plants by: (a) xylem vessels and tracheid’s? (b) Sieve tubes (or phloem)?

Xylem vessels and tracheid’s transport water in Sieve tubes transport food in the

BiologyClass 10ICSE

What is the name of tissues which transport: (a) food in a plant? (b) water and minerals in a plant?

Phloem transports the food in a Xylem transports water and minerals in a

BiologyClass 10ICSE

An organism X having breathing organs A lives on land. When organism X goes under water, it cannot survive for a long time unless carrying an oxygen cylinder. On the other hand, the organism Y having breathing organs B always lives in water and if taken out of water, it dies after a short while. A third organism Z having breathing organs C and D which lives on the banks of ponds, lakes and rivers can survive on land as well as in water equally well. (a) What could organism X be? Name the breathing organs A. (b) What could organism Y be? Name the breathing organs B. (c) What could organism Z be? Name the breathing organs C and D. (d) Out of X, Y and Z, which organism is (i) amphibian, (ii) aquatic, and (iii) terrestrial?

Organism X is a human The breathing organs A are lungs. Organism Y is a The breathing organs B are gills. Organism Z is a The breathing organ C is skin and D are lungs. (i) Z is an amphibian because it leaves both on land and Y is an aquatic organism because it leaves only in X is a terrestrial organism because it leaves only on

BiologyClass 10ICSE

When a person breathes in air, the air enters into his body through an organ A having two holes B in it. The air then passes through pharynx and larynx and enters into a tube C. The tube C divides into two smaller tubes D at its lower end. The two smaller tubes are attached to two respiratory organs E. Each smaller tube divides inside the organs E to form a large number of still smaller tubes called F. The smallest tubes F have air-sacs G at their ends in which gaseous exchange takes place in the body of the person. What are A, B, C, D, E, F and G?

A: noseB: nostrils C: trachea D: bronchi E: lungsF: bronchioles G: alveoli

BiologyClass 10ICSE

Consider the following chemical reactions which take place in different organisms/tissues under various conditions: (i) Glucose Respiration Ethanol + Carbon dioxide + Energy (ii) Glucose Respiration Carbon dioxide + Water + Energy (iii) Glucose Respiration Lactic acid + Energy (a) Name one organism which respires according to equation (i) above. (b) Name one organism which respires according to equation (ii) above. (c) When and where does respiration represented by equation (iii) above take place? (d) Which equation/equations represent aerobic respiration? (e) Which equation/equations represent anaerobic respiration? (f) Which of the above reactions produces the maximum amount of energy?

Bacteria Plants In humans beings, in the muscle tissue the respiration represented by equation (iii) It occurs Equation (ii) Equation (i) Aerobic respiration, produces maximum amount of

BiologyClass 10ICSE

Some sugar solution is taken in a test-tube and a little of substance X in powder form is added to it. The mouth of test-tube is closed with a cork and allowed to stand for some time. On opening the cork, a characteristic smell of substance Y is obtained and a gas Z is also observed to be formed. The gas Z extinguishes a burning matchstick. (a) What could be (i) X, (ii) Y, and (iii) Z? (b) What is the process of converting sugar into substance Y by the action of X known as? (c) What type of respiration is exhibited by X in the above process?

(i) X is yeast (ii) Y is ethanol (iii) Z is carbon dioxide Fermentation X exhibits the anaerobic

BiologyClass 10ICSE

There are five animals P, Q, R, S and T. The animal P always lives in water and has gills for breathing. The animal Q can stay in the water as well as on land and can breathe both, through moist skin and lungs. The animal R lives in soil and breathes only through its skin. The animal S lives on land and breathes through spiracles and tracheae. And animal T lives in water and breathes through its cell membrane. (a) Which of the animals could be Amoeba? (b) Which of the animals could be frog? (c) Which animal could be fish? (d) Which animal could be grasshopper? (e) Which animal could be earthworm?

T is Amoeba as it leaves in water and respires through cell Q is frog as it leaves on land and P is fish as it has S is grasshopper as it uses spiracles and R is earthworm as it leaves on soil

BiologyClass 10ICSE

A, B and C are three living organisms. The organism A is a unicellular fungus that can live without air. It is used in the commercial production of an organic compound P from molasses. The organism B is a unicellular animal which lives in water and feeds and moves by using pseudopodia. It breathes through an organelle Q. The organism C is a tiny animal that acts as a carrier of malarial parasite. It breathes and respires through a kind of tiny holes R and air-tubes S in its body. (a) What are organisms (i) A (ii) B, and (iii) C? (b) Name (i) P (ii) Q (iii) R, and (iv) S. (c) Which organism/organisms undergo aerobic respiration? (d) Which organism/organisms undergo anaerobic respiration?

(i) A - (ii) B - Amoeba. (iii) C - mosquito. (i) P is Q is the cell membrane R is spiracle S is tracheae Organisms B and C Organism A,

BiologyClass 10ICSE

During the respiration of an organism A, 1 molecule of glucose produces 2 ATP molecules whereas in the respiration of another organism B, 1 molecule of glucose produces 38 ATP molecules. (a) Which organism is undergoing aerobic respiration? (b) Which organism is undergoing anaerobic respiration? (c) Which type of organism, A or B, can convert glucose into alcohol? (d) Name one organism which behaves like A. (e) Name two organisms which behave like B.

Organism B Organism A Organism A can convert glucose into alcohol, as it undergoes anaerobic In this process, glucose breaks down to form alcohol and carbon dioxide. Plants Bacteria

BiologyClass 10ICSE

Which of the following is most likely to have a much higher breathing rate? (a) man (b) fish (c) dog (d) sparrow

(b) Fish Fish uses the dissolved oxygen in water, which is in a minimal quantity. Hence fish has higher breathing rate than other organisms.

BiologyClass 10ICSE

In cockroaches, air enters the body through: (a) lungs (b) gills (c) spiracles (d) skin

BiologyClass 10ICSE

During marathon, we sometimes get painful contractions of leg muscles due to the accumulation of one of the following in leg muscles. This is: (a) carbon dioxide (b) alcohol (c) lactose (d) lactic acid

lactic acid The anaerobic respiration by the muscles brings about a partial breakdown of glucose to form lactic acid.

BiologyClass 10ICSE

One of the following organisms does not depend on the simple diffusion of gases for breathing and respiration. This organism is: (a) Amoeba (b) Prawn (c) Planaria (d) Bryophyllum

(b) Prawn Prawn is an aquatic animal that respires through gills, other organisms depend on diffusion of gases for breathing.

BiologyClass 10ICSE

The breathing and respiration in woody stem of a plant takes place through: (a) root hair (b) lenticels (c) closed stomata (d) open stomata

(b) lenticels In woody stems, the bark (outer covering of the stem) has lenticels for gaseous exchange.

BiologyClass 10ICSE

The photosynthesis in a plant is not taking place during the day time if the plant is releasing: (a) water vapor (b) oxygen (c) carbon dioxide (d) all the above

carbon dioxide During daytime, the carbon dioxide produced through respiration is used up in photosynthesis by leaves. So carbon dioxide is not released during day time.

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